The Foreskin.
...also called the prepuce [Latin: prae = in front & putium = penis] is the protective sheath of penile skin, which covers the head of the penis, otherwise called the glans [Greek: balanos = acorn & Latin: (pl) glandes (pen[i]um) = acorn (of the penis)].
The skin of the penis is continuous, forming a cylindrical double layer of tissue consisting of the outer foreskin tapering at the acroposthion, which inverts into itself becoming the inner foreskin.
Upon erection it may retract and unroll of itself into a single layered cylinder, but not necessarily and can be retracted manually.
Some foreskins however are tight, retracting with difficulty and some foreskins don’t retract at all.
This condition called Phimosis [Greek: muzzling] is the natural state for neonates (new born) and boys.
The synechia, also known as the balano-preputial membrane or the
balano-preputial lamina is the membrane that attaches the inner surface of the foreskin to the glans.
A Danish study found that 50% of foreskins became retractable (desquamation) before 10 years of age and 99% of foreskins were retractable by the end of puberty through the vigorous erections of adolescence, helped by masturbation.
Therefore the foreskin should be left alone whilst a boy is growing up and should not be forcefully retracted for any reason whatsoever, because it may tear or harm the penis in some way.
The only person to retract a child's foreskin should be the child himself, when he has discovered that his foreskin is ready to retract.
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